Homozygosity in self-pollinating crops Which of the following self-pollinating plants tend to be highly homozygous across generations?

Introduction / Context:Self-pollination causes inbreeding, increasing homozygosity with each generation. Many crops are autogamous (selfers) and show high fixation of alleles, which impacts breeding strategies and varietal stability.

Given Data / Assumptions:

• Pea (Pisum sativum) is a classic selfer used by Mendel.
• Tomato (Solanum lycopersicum) predominantly self-pollinates in most cultivars.
• Peach (Prunus persica) is self-fruitful in many commercial varieties.

Concept / Approach:Under continued selfing, heterozygosity is halved each generation. After multiple generations, most loci become fixed (homozygous). Thus, autogamous crops accumulate high homozygosity unless purposely outcrossed.

Step-by-Step Solution:

Verification / Alternative check:Breeding manuals describe development of pure lines through repeated selfing in peas and tomatoes; self-fruitful stone fruits like peach commonly set fruit without cross-pollination.

Why Other Options Are Wrong:

• Picking any single crop ignores that all listed are self-pollinating and become homozygous.
• None of these contradicts known mating systems.

Common Pitfalls:Assuming perennial fruit trees must be cross-pollinated; many peach cultivars are self-fertile.

Final Answer:All of these